WA Wave 30/0.4 – 30mm ID Spring Steel Wave Washer – 0.4mm (Light) 30mm ID x .4mm/Light-Action Wave Washer for removing that last bit of play from 30mm BB spindles and ensure proper bearing loading. 0.4mm/Light-action is recommended for use with radial bearings. Enduro makes a wide selection of spacers and seals to ensure proper custom bottom bracket and crankset spacing no matter what the combination of components